Hi
Back in 1894 the 6,5x55 were developt for combined millitery of Sweden/Norway and the pressurestandars were set to 3500 bar.
Later (1967) the Norwegian rifleasosiasjen(DFS) lowerd the max presure for Kragammo to 3300 bar, and the CIP standard for 6,5x55 is incresed to 3800 bar. Comersiali loded Eropian ammo is loded to CIP, not neseserili to max presure but you will not know.
Swedish surpluss ammo was loaded to the old standards and the most common "M41 prik" have a normal presure of 3200bar
and Kragsafe, is it corrosive, probobly but if you clean and oil your gun it is not more off a problem inn the Krag than it is inn a Mauser.